Removed support for Python 2.4
Use the accepts_none decorator as a decorator

and remove a couple of tests which make no sense:
when I know f(X) will never be called with X=None,
a test for X==None in f is superfluous
Add FieldSet.reconfigure

This is like .configure, but does not reset the form --
thus, incremental changes are possible.

This is an API extension, thus the new version is 1.5.0.
Don't check session objects with isinstance

it may be a proxy
Merge old master branch into v1.5
Merge master / v1.5
fix fa_cgi.py to be parseable with py2

so that nosetests doesn't die on us
we're not at 1.5.2 yet!
Merge branch 'v1.5'
The master branch is v1.6 devel
updated the much-neglected CHANGELOG.txt file
Create just one level of content directory

otherwise the changelog entries totally drown the text after it
Tag v1.5.2
Start 1.5.3 branch
Merge tag 'v1.5.2'

Pull a couple of neglected changes from the 1.4 branch

Conflicts:
	formalchemy/__init__.py
missing imports
Allow overriding renderer_opts via an "attrs=…" column option
typo
document current release process
Prepare release